form {
    margin: 0 auto;
    width: 300px;
}
input[type="text"] {
    width: 100%;
    padding: 5px;
    margin-bottom: 10px;
}
input[type="submit"] {
    width: 100%;
    padding: 5px;
    background-color: #4CAF50;
    color: white;
    border: none;
    cursor: pointer;
}
input[type="submit"]:hover {
    background-color: #45a049;
}
input[type="hidden"] {
    display: none;
}
input[type="text"]:disabled {
    background-color: #f2f2f2;
}
input[type="text"]:focus {
    outline: none;
}
.bookCover{
    width: 50px;
    height: 50px;
}